Discussion
The rock cycle describes
Answer: C
Correct answer: The continuous transformation of rock between igneous, sedimentary and metamorphic forms
The rock cycle is the set of processes by which rock is continually converted from one of the three classes into another, with no beginning or end. Magma cools to form igneous rock. Weathering and erosion break it into sediment, which is transported, deposited, compacted and cemented into sedimentary rock. Burial under heat and pressure converts that into metamorphic rock. Further heating melts it back to magma, and the cycle begins again. The important point is that the route is not fixed. Any rock type can become any other: metamorphic rock can be eroded into sediment without ever melting, sedimentary rock can be melted directly, igneous rock can be metamorphosed. The cycle is driven by two energy sources - the Earth’s internal heat, which powers plate tectonics, melting and metamorphism, and solar energy, which powers weathering, erosion and transport. One consequence is that the rock beneath our feet has been recycled many times, which is why almost no crust survives from the Earth’s first few hundred million years.
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